Damanik EM, Girsang TS, Nasution H, Simarmata B, Lumbantobing L. The Effect of Work Discipline on Employee Work Productivity at Perumda Tirtanadi Medan Denai Branch. Innovative [Internet]. 2023 Dec. 6 [cited 2026 May 5];3(6):4043-56. Available from: http://j-innovative.org/index.php/Innovative/article/view/6641